PHP实现文件上传操作和封装(2)

<?php
class UpFile{
 public $maxsize=2; //1M
 public $errmsg="";
 public $ext = "png,jpg,bmp,gif";
 
 //上传大小是否符合
 function isAllowSize($size)
 {
 if($size <= $this->maxsize*1024*1024)
 {
 return true;
 }
 else 
 {
 return false;
 }
 }
 
 //判断后缀名是否符合
 function isAllowExt($ext)
 {
 return in_array(strtolower($ext), explode(',', $this->ext));
 }
 
 //获取文件后缀名
 function getFileExt($file)
 {
 $arr = explode('.', $file);
 return end($arr);
 }
 
 //图片上传，$pickey为input的name值，$save_path保存路径
 function upload($pickey,$save_path)
 {
 if(!isset($_FILES[$pickey]))
 {
 return false;
 }
 
 if($_FILES[$pickey]['error'] !=0)
 {
 $this->errmsg = $this->getErrorType($_FILES[$pickey]['error']);
 return false;
 }
 $file_ext = $this->getFileExt($_FILES[$pickey]['name']);
 echo $file_ext;
 if(!$this->isAllowExt($file_ext))
 {
 $this->errmsg = "文件后缀名不符合";
 return false;
 }
 echo $_FILES[$pickey]['size'];
 if(!$this->isAllowSize($_FILES[$pickey]['size']))
 {
 $this->errmsg = "大小超过限制";
 return false;
 }
 
 $str = "abcdefjhijkmnpqrst23456789";
 $filename = date("YmdHis",time()).substr(str_shuffle($str), 0,6);
 $dir = $this->makeDir($save_path);
 if(move_uploaded_file($_FILES[$pickey]['tmp_name'], $dir.'/'.$filename.'.'.$file_ext))
 {
 
 return true;
 }
 else 
 {
 $this->errmsg = "上传失败";
 return false;
 }
 }
 
 //创建目录
 function makeDir($save_path)
 {
 $path = $save_path.'/'.date("Ymd",time());
 
 if(is_dir($path) || mkdir($path,0777,true)) //不存在该目录文件，创建
 {
 echo $path;
 return $path;
 }
 else 
 {
 return false;
 }
 }
 
 //错误类型分析
 function getErrorType($error)
 {
 $errmsg = "";
 switch ($error)
 {
 case 0:
 $errmsg = "文件上传成功";
 break;
 case 1:
 $errmsg = "上传的文件超过了 php.ini 中 upload_max_filesize 选项限制的值";
 break;
 case 2:
 $errmsg = "上传文件的大小超过了 HTML 表单中 MAX_FILE_SIZE 选项指定的值";
 break;
 case 3:
 $errmsg = "文件只有部分被上传";
 break;
 case 4:
 $errmsg = "没有文件被上传";
 break;
 case 6:
 $errmsg = "找不到临时文件夹";
 break;
 case 7:
 $errmsg = "文件写入失败";
 break;
 }
 return $errmsg;
 }
}

<?php
include 'upfile.class.php';
 
$upfile = new UpFile();
if($upfile->upload('uploadpic', "./fileupload"))
{
 echo "ok";
}
else
{
 echo $upfile->errmsg;
}